ASTM C210-95 (2024) 绝热耐火砖二次加热变化的试验方法

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Designation: C210 −95 (Reapproved 2024)
Standard Test Method for
Reheat Change of Insulating Firebrick
1
This standard is issued under the fixed designation C210; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method covers the determination of the perma-
nent linear (and volume) change of insulating firebrick upon
reheating under prescribed conditions.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
C24 Test Method for Pyrometric Cone Equivalent (PCE) of
Fireclay and High-Alumina Refractory Materials
C155 Classification of Insulating Firebrick
E230/E230M Specification for Temperature-Electromotive
Force (emf) Tables for Standardized Thermocouples
E1256 Test Methods for Radiation Thermometers (Single
Waveband Type)
3. Significance and Use
3.1 Insulating firebrick (IFB) are classified by their bulk
density and reheat change (see Classification C155). This test
method defines thermal stability by measurement of IFB’s
reheat change following 24 h at a test temperature.
3.2 Since this test exposes the entire sample to an isothermal
temperature condition, the user should be aware that most
applications for IFB involve a thermal gradient which may
cause the IFB’s dimensions to change differentially.
4. Apparatus
4.1 The test kiln shall be capable of maintaining the
required temperature with a variation of not more than one half
a standard pyrometric cone over the hearth area during the
prescribed heating schedule. If a gas- or oil-fired kiln is used,
it shall be of the downdraft type and of such a design as not to
permit the flame from the burner to impinge upon the test
specimens. The kiln atmosphere during the test shall be kept as
oxidizing as is practicable.
5. Procedure
5.1 Test Specimens and Measurements:
5.1.1 The test specimens shall consist of three brick (Note 1)
measuring 9 in. by 4
1
⁄
2
in. by 2
1
⁄
2
in. or 3 in. (228 mm by
114 mm by 64 mm or 76 mm) or three pieces of these
dimensions cut out of larger shapes.
NOTE 1—Three supporting brick from the same lot as the test specimens
are required also, so that the test sample is comprised of six brick.
5.1.2 Each specimen shall be labeled with ceramic paint,
and before and after heating they shall be carefully measured
for length (Note 2), width, and thickness. Three measurements
(Note 3) to the nearest 0.02 in. (0.5 mm) shall be taken for each
dimension and the average of these shall be used. Each
dimension shall be measured in three places along the longi-
tudinal center line on opposite faces, one measurement at the
center of the line and one
1
⁄
2
in. (13 mm) in from each edge.
Fig. 1 shows the location at which these measurements are to
be made.
NOTE 2—For classifying IFB according to Classification C155, obtain
the reheat change from the 9 in. (228 mm) dimension measurements only.
NOTE 3—Because of the large pore size of some IFB, it is difficult to
measure by means of calipers directly on the brick surfaces. Accuracy may
be obtained by holding two small pieces of flat polished steel plate of
known thickness against the faces between which the dimension is to be
obtained, and calipering on the outside steel surfaces rather than directly
1
This test method is under the jurisdiction of ASTM Committee C08 on
Refractories and is the direct responsibility of Subcommittee C08.03 on Physical
Properties.
Current edition approved April 1, 2024. Published April 2024. Originally
approved in 1946. Last previous edition approved in 2019 as C210 – 95 (2019).
DOI: 10.1520/C0210-95R24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
against the brick surfaces. It is permissible to use a measuring device to
obtain the dimensions of the brick, provided the measurements are not
affected by large pores in the surface.
5.2 Placing Test Specimens in Kiln:
5.2.1 Place the test specimens in the kiln so that each will
rest on a 9 in. by 2
1
⁄
2
in. or 3 in. (228 mm by 64 mm or 76 mm)
face. Place each specimen upon the 9 in. by 2
1
⁄
2
in. or 3 in. face
of a supporting brick that shall be from the same lot as the test
specimen. Place between the test specimen and the supporting
member a layer of suitable refractory material, that is nonre-
active under the test conditions and passes an ASTM No. 16
(1.18 mm) sieve (equivalent to a 14-mesh Tyler Standard
Series) and retained on an ASTM No. 40 (425 µm) sieve
(equivalent to a 35-mesh Tyler Standard Series). Place each
specimen no closer than 1
1
⁄
2
in. (38 mm) from either the other
test specimens or the furnace wall and parts.
6. Temperature Measurement
6.1 Measure the temperature within the kiln by means of an
appropriate calibrated thermocouple. Refer to Table 1 and
Table 2 of Specification E230/E230M for the tolerances and
upper temperature limits for use of various thermocouples. At
higher temperatures, the thermocouple may be withdrawn and
a calibrated optical or radiation pyrometer (refer to Test
Methods E1256) can be used. Place the hot junction of the
thermocouple or sight the pyrometer so as to register the
temperature of the test specimens. Make temperature readings
at intervals not greater than 15 min. Check the kiln periodically
by thermocouples, pyrometers, or pyrometric cones (refer to
Test Method C24) to ensure that temperature over the hearth
does not differ by more than 25 °F (14 °C) or one half-cone.
7. Test Temperature Schedules and Duration of Test
7.1 The temperature to be used for the test shall depend on
the classification into which the IFB falls (see Classification
C155).
7.2 The heating schedules for the various classes of IFB are
given in Table 1. Maintain the maximum temperature for a
period of 24 h, and leave the specimens in the kiln until the
temperature has fallen to about 800 °F (430 °C). Blisters may
develop on the surface of the test brick, in which case remove
them by rubbing their surfaces very lightly with a fine abrasive
block before remeasuring in accordance with 5.1.2.
8. Calculation and Report
8.1 Reheat Change—Calculate the reheat change in percent
from the average measurement for the dimension obtained
before and after reheating.
8.2 Reheat Volume Change—When the reheat volume
change is requested, calculate it from the average measurement
for the three dimensions obtained before and after reheating, as
follows:
V5
@
~
V
o
2V
f
!
/V
o
#
×100 (1)
where:
V= volume change, percent,
V
o
= original volume, and
V
f
= final volume.
8.3 Report—When the test is conducted for evaluating IFB
in accordance with Classification C155, the average linear
change for the 9 in. (228 mm) dimension only shall be re-
ported; otherwise, or when specified, the average of the reheat
change for the length, width, and thickness shall be reported
and, if requested, the average reheat volume change.
9. Precision and Bias
9.1 Interlaboratory Test Program—An interlaboratory test
program between six laboratories was conducted. Each labo-
ratory received three samples each of three IFBs: K-20, K-26
LI, and K-3000. The bricks were provided by Thermal Ceram-
ics. The laboratories participating were C.E. Minerals, Orton
RRC, North American Refractories, National Refractories,
Thermal Ceramics, and Premier Refractories.
9.2 Precision:
9.2.1 Repeatability—The maximum permissible difference
due to test error between two test results obtained by one
operator on the same material is given by the repeatability
interval and the relative repeatability interval (coefficient of
variation). The 95 % repeatability intervals are given in Table
2. Two test results that do not differ by more than the
repeatability interval will be considered the same and,
conversely, two test results that do differ by more than the
repeatability interval will be considered different.
9.2.2 Reproducibility—The maximum permissible differ-
ence due to test error between two test results obtained by two
operators in different laboratories on the same type of material
using the same type of test equipment is given by the
reproducibility interval and relative reproducibility interval
(coefficient of variation). The 95 % reproducibility intervals
are given in Table 2. Two test results that do not differ by more
than the reproducibility interval will be considered the same
and, conversely, two test results that do differ by more than the
reproducibility interval will be considered different.
9.3 Bias—No justifiable bias statement is possible since the
true values of the properties of the reference material are not
defined.
NOTE 1—The dots on the center line of each face are
1
⁄
2
in. (13 mm) in
from each edge, and the cross on the axis is in the center. These positions
indicate the points at which three measurements for each dimensions are
to be made.
FIG. 1 Test Brick Showing Measurement Locations
C210 − 95 (2024)
2
10. Keywords
10.1 insulating firebrick; permanent linear change; refracto-
ries; reheat change
TABLE 1 Heating Schedule for Reheat Change of Various Groups of Insulating Firebrick
Elapsed Time
from Start of
Heating, h
Allowable
Deviation
from
Schedule,
±°F (°C)
Temperature of Test Specimen, °F (°C) (The highest temperature in each column shall be maintained for 24 h)
Group 16
1550 °F
(845 °C)
Test
Group 20
1950 °F
(1065 °C)
Test
Group 23
2250 °F
(1230 °C)
Test
Group 26
2550 °F
(1400 °C)
Test
Group 28
2750 °F
(1510 °C)
Test
Group 30
2950 °F
(1620 °C)
Test
Group 32
3150 °F
(1730 °C)
Test
Group 33
3250 °F
(1790 °C)
Test
1 50
(28)
1050
(565)
1310
(710)
1470
(800)
1750
(955)
1750
(955)
1750
(955)
1750
(955)
1750
(955)
1
1
⁄
2
35
(19.5)
1260
(680)
1580
(860)
1820
(995)
2130
(1165)
2130
(1165)
2130
(1165)
2200
(1205)
2200
(1205)
2 20
(11)
1420
(770)
1790
(975)
2050
(1120)
2370
(1300)
2370
(1300)
2370
(1300)
2430
(1330)
2500
(1370)
2
1
⁄
2
15
(8.5)
1520
(825)
1910
(1045)
2200
(1205)
2510
(1375)
2560
(1405)
2560
(1405)
2640
(1450)
2700
(1480)
3 15
(8.5)
1550
(845)
1950
(1065)
2250
(1230)
2550
(1400)
2680
(1470)
2680
(1470)
2800
(1540)
2840
(1560)
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
3
1
⁄
2
15
(8.5)
. . . . . . . . . . . . 2730
(1500)
2810
(1545)
2890
(1590)
2960
(1625)
4 15
(8.5)
. . . . . . . . . . . . 2750
(1510)
2880
(1580)
2960
(1625)
3040
(1670)
...
...
...
...
...
...
...
...
...
...
...
...
4
1
⁄
2
15
(8.5)
... ... ... ... ... 2930
(1610)
3020
(1660)
3100
(1705)
5 15
(8.5)
... ... ... ... ... 2950
(1620)
3060
(1680)
3150
(1730)
...
...
...
...
...
...
...
...
5
1
⁄
2
15
(8.5)
... ... ... ... ... ... 3100
(1705)
3175
(1745)
6 15
(8.5)
... ... ... ... ... ... 3125
(1720)
3200
(1760)
6
1
⁄
2
10
(5.5)
... ... ... ... ... ... 3150
(1730)
3225
(1775)
7 10
(5.5)
... ... ... ... ... ... 3240
(1782)
7
1
⁄
2
10
(5.5)
... ... ... ... ... ... ... 3250
(1790)
TABLE 2 Precision Statistics
Attribute
Average Precision Data Relative Precision
Linear
%
Standard
Deviation
Within
Laboratories,
%
Sr
Standard
Deviation
Between
Laboratories,
%
SR
Repeatability
Interval,
%
r
Reproducibility
Interval,
%
R
Within
Laboratories,
%
Vr
Between
Laboratories,
%
VR
Relative
Repeatibility,
%
r
Relative
Reproducibility,
%
R
Reheat Change K 20 0.01 0.03 0.03 0.08 0.08 387.30 387.30 1084.44 1084.44
Reheat Change K 26 LI −0.26 0.09 0.11 0.24 0.31 −33.48 −42.96 −93.74 −120.28
Reheat Change K 3000 −0.24 0.08 0.18 0.23 0.50 −33.66 −73.41 −94.23 −205.54
C210 − 95 (2024)
3

标签： #绝热耐火砖 #二次加热变化试验方法

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ASTM C210-95 (2024) Standard Test Method for Reheat Change of Insulating Firebrick 绝热耐火砖二次加热变化的试验方法

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